Air supplementing and enthalpy increasing heat pump system

Abstract

The invention provides an air supplementing and enthalpy increasing heat pump system which comprises first one-way valves and second one-way valves. The first one-way valves are connected to the two ends of a first electronic expansion valve in parallel, and the opening direction of the first one-way valves is opposite to the flowing direction of a refrigerant when the air supplementing and enthalpy increasing heat pump system operates in a first state. The second one-way valves are connected to the two ends of a second electronic expansion valve in parallel, and the opening direction of the second one-way valves is opposite to the flowing direction of the refrigerant when the air supplementing and enthalpy increasing heat pump system operates in a second state. By means of the air supplementing and enthalpy increasing heat pump system, the problem of frequent action of electronic expansion valves of an air supplementing and enthalpy increasing heat pump system adopting the two electronic expansion valves for refrigerant direction changing in the prior art is solved, and the acting number of times of the electronic expansion valves is reduced.

Description

technical field [0001] The invention relates to the technical field of heat pumps, in particular to a heat pump system for supplementing air and increasing enthalpy. Background technique [0002] The technology of supplementing air to increase enthalpy has been applied to the air source heat pump unit at present, and it is one of the effective solutions to solve the operation of the unit under harsh working conditions. The northern coal-to-electricity heating unit mostly adopts this technology to ensure the ultra-low temperature operation of the unit. At present, most control systems only have the function of heating, supplementing air and increasing enthalpy, or through other valves to perform system reversing, so as to ensure that the cooling and heating of the heat pump unit have this function. [0003] figure 1 is a schematic diagram of a heat pump system according to related technologies, such as figure 1 As shown in Fig. 1, the refrigerant circulation main circuit an...

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Problems solved by technology

[0006] The present invention provides a heat pump system for supplementing air and increasing enthalpy to at least solve the problem of frequent action of electronic expansion valves in the heat pump system for supplementing air and increasing enthalpy with two electronic expansion valves in the related art.

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